Late Quaternary tephrostratigraphy of southern Chile and Argentina
Late Quaternary tephrostratigraphy of southern Chile and Argentina
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DOI：
10.1016/j.quascirev.2014.02.007
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发表时间：
2014-04-01
影响因子：
4
通讯作者：
Moreno-Roa, Hugo
中科院分区：
文献类型：
--
作者：
Fontijn, Karen;Lachowycz, Stefan M.;Moreno-Roa, Hugo
安第斯山脉南部和南部火山带由74个已知具有冰后活动的火山中心组成。其中至少有21个在第四纪晚期发生了一次或多次大规模爆炸性喷发，将火山灰分散在大片地区。因此，这些Tephra层在智利南部和阿根廷的古环境研究中具有巨大的潜力，在研究南半球气候动力学特别有用的古环境研究中，Tephra层具有巨大的潜力。然而，到目前为止，在这一地区很少作为一种对比和测年工具充分利用年代学。在这里，我们回顾了南部和南部火山带现有的冰后冰盖地层记录，并编制了一个数据库，其中包括这些火山在冰湖、海洋、泥炭和洞穴沉积物记录中的已知出现的冰盖。我们解决了在以前的文献中出现的关于森林地层学的不一致和修订的问题，并讨论了在相关海洋地层学方面的挑战和该地区的海洋地层学记录的局限性。这项研究突出了在我们对这些火山喷发历史的了解中仍然存在的许多空白，但也揭示了在这一地区作为对比工具的Tephra基本上没有得到充分利用的潜力。在许多湖泊和泥炭沉积剖面中保存下来的盖夫拉层严重缺乏充分的地球化学分析，这是智利南部和阿根廷特别重要的盖层地层记录，因为缺乏表面保存。(C)2014年提交人。爱思唯尔有限公司出版。
The Southern and Austral Volcanic Zones of the Andes comprise 74 volcanic centres with known postglacial activity. At least 21 of these have had one or more large explosive eruptions in the late Quaternary, dispersing tephra over vast areas. These tephra layers therefore have great potential as tephrochronological marker horizons in palaeoenvironmental studies in southern Chile and Argentina, a region that is particularly useful to study climate dynamics of the southern hemisphere. However, to date tephrochronology has rarely been fully utilised in this region as a correlation and dating tool. Here we review the existing post-glacial tephrostratigraphic record of the Southern and Austral Volcanic Zones, and compile a database of known occurrences of tephra from these volcanoes in ice and lacustrine, marine, peat, and cave sediment records. We address the inconsistencies in and revisions of the tephrostratigraphies presented in prior literature, and discuss the challenges in correlating tephras and the limitations of the tephrostratigraphic record in this area. This study highlights the many gaps that still exist in our knowledge of the eruptive histories of these volcanoes, but also reveals the largely underutilised potential of tephra as a correlation tool in this region. This is exemplified by the severe lack of adequate geochemical analysis of tephra layers preserved in many lacustrine and peat sediment sections, which are particularly important tephrostratigraphic records in southern Chile and Argentina due to the paucity of surface preservation. (C) 2014 The Authors. Published by Elsevier Ltd.